package com.example.lenovo.spinnertest106;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
private TextView tvinfo;
    private Spinner spinner;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        //1定义数据源；
        String[] cities={"北京","上海","大连","天津"};
        //2定义适配器；
        final ArrayAdapter<String> adapter=new ArrayAdapter<String>(
                this,android.R.layout.simple_spinner_item,cities
        );
        //3设置下拉按钮样式；
        adapter.setDropDownViewResource(
                android.R.layout.simple_spinner_dropdown_item);
        //4Spinner与Adapter绑定
        spinner.setAdapter(adapter);
        spinner.setPrompt("请选择城市：");
        //5Spinner点击条目事件
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                tvinfo.setText("您选择的城市是："+
                        parent.getItemAtPosition(position).toString());

            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
    }

    private void init() {
        tvinfo=(TextView)findViewById(R.id.textView);
        spinner=(Spinner)findViewById(R.id.spinner);
    }
}
